/*
 * Copyright [2013-2021], Alibaba Group Holding Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.alibaba.polardbx.druid.sql.ast.statement;

import com.alibaba.polardbx.druid.sql.ast.SQLExpr;
import com.alibaba.polardbx.druid.sql.ast.SQLStatementImpl;
import com.alibaba.polardbx.druid.sql.visitor.SQLASTVisitor;
import com.google.common.base.Preconditions;

public class SQLAlterSystemLeaderStatement extends SQLStatementImpl implements SQLAlterStatement {

    /**
     * the host:port of dn.
     */
    private SQLExpr nodeId;

    public SQLAlterSystemLeaderStatement() {
    }

    @Override
    protected void accept0(SQLASTVisitor visitor) {
        if (visitor.visit(this)) {
            acceptChild(visitor, nodeId);
        }
        visitor.endVisit(this);
    }

    public SQLExpr getNodeId() {
        return nodeId;
    }

    public void setNodeId(SQLExpr nodeId) {
        Preconditions.checkArgument(this.nodeId == null, "It's invalid to set multi leader!");
        this.nodeId = nodeId;
    }
}
